Not sure whether you're being sarcastic, but in case you are:

The internet, including this forum, is chock-full of people making useless comments like "well I like it" or "it works for me", just asserting their views or experiences while advancing no argument and offering no discussion.

The post you just replied to is not doing that.

The poster you replied to is taking the time to describe and explain his experiences and their implications. He's contributed a lot more to the conversation than you have, and doesn't deserve sarcasm.

You weren't sure whether I was being sarcastic, yet you /are/ sure that the post I sarcastically responded to was written in the spirit of contribution, and was not itself insincere.

Sincerity doesn't matter when the commenter is correct. I've taken plenty of math classes, and everything he describes is accurate.